Explanation: Arunachal Pradesh, located in the northeastern part of India, is characterized by its diverse geography and rich river systems. The state is home to several major rivers, each playing a significant role in the region's ecology and economy. Among these rivers, the Siang River is one of the most prominent.
The Siang River, also known as the Tsangpo-Brahmaputra, originates from the Tibetan Plateau and flows through Arunachal Pradesh before merging with the Brahmaputra in Assam. It is a crucial river for the state, providing water for agriculture, supporting local ecosystems, and serving as a vital transportation route. The river is also significant for its cultural and religious importance to the local communities.
The Brahmaputra River, while not primarily located in Arunachal Pradesh, is a major river in the region. It is formed by the confluence of the Siang and Dibang rivers, both of which originate in Tibet and flow through Arunachal Pradesh. The Brahmaputra is one of the largest rivers in the world and plays a significant role in the geography and economy of northeastern India.
The Lohit River is another major river in Arunachal Pradesh. It originates from Tibet and flows through the state before joining the Siang River to form the Brahmaputra. The Lohit is an important river for the state, supporting agriculture and providing a habitat for diverse flora and fauna.
The Manas River, while significant in Assam, is not a major river in Arunachal Pradesh. It forms a part of the border between Assam and Bhutan and is not a primary river of Arunachal Pradesh.
In summary, the Siang River is a major river in Arunachal Pradesh, playing a crucial role in the state's geography, economy, and culture. It is one of the primary rivers of the region, making it the correct answer to the question.